Improvement in hot-air furnaces



W. S. STEVENSON.

Hot-Air Furnaces. No.147,444.- Pa tented Feb.10.1874

mum l l I" I I I II Ill v I M I WiTN S 5 1:5= INVENTUFL Wk UW a UNITEDSTATES PATENT QFFIGEY.

WALTER S. STEVENSON, OF PHILADELPHIA, PENNSYLVANIA.

lMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 141?,444, datedFebruary 10, 1874; application file December 23, 1873. I

To all whom it may concern:

Be it known that I, WALTER S. STEVEN- soN, of Philadelphia, in thecounty of Philadelphia and State of Pennsylvania, have invented certainnew and useful. Improvements in HeatingFurnaces; and I do hereby declarethe following to be a full, clear, and exact description of theinvention such as will enable others skilled in the art to which itpertains to make and use it, reference being had to the accompanyingdrawings, which form part of this specification.

The nature of my invention relates to an improvement inheating-furnaces; and it consists in a heating-drum placed upon the topof a furnace, in which are inclosed a number of air-tubes, the upperends of which tubes open around the base of the drum. In this drum isplaced a deflector or wall, which throws the heat and products ofcombustion outward against the walls of the drum, so that, as the airrises from the tubes and strikes against the drum, it will be stillfurther heated before passing off up the pipes.

Figure l is a vertical section of my furnace. Fig. 2 is a horizontalsection taken through the heatin g-druin.

(t represents the ordinary furnace, which is inclosed by the hood orcasing c, in the usual manner. Upon the top of the furnace is placed theheating-drum (l, in which is placed the curved wall or deflector e,which throws the heat and products of combustion outward against thewalls of the drum, as shown by the arrows, causing them to pass over agreater space before passing up the chimney, and thus utilizing the heatin heating the drum to as high a degree as possible. Placed whollywithin the combustionchamber of the furnace are a number of hot-airtubes, 9, through which the air rises from below. upper ends of thesetubes open around the base of the drum, as shown in Fig. 2, so that asthe heated air rises upward from tubes it strikes against theheatedsides of the drum, and is still further heated before it escapesup the pipes l to the rooms above. By means of the deflector e, placedin the drum (1, and which throws the heat outward against the sides ofthe drum, the heat which would otherwise escape uselessly up the chimneyis utilized as nearly as possible, heating the drum to such an extentthat the hot air from the tubes is still further heated when it strikesagainst its sides.

I am aware that a heating drum placed upon the top of a furnace is notnew, and I do not desire to claim such; but my invention is intended asan improvement upon this class of heaters.

Having clai1n- The combination of the furnace a, having the air-tubes 9arranged within the combustion-chamber, the drum 61, provided with thedeflector e for throwing the heat outward against its sides, and theinclosing-hood c, the parts being arranged as shown whereby the hot airrising from the tubes 9 is still further heated before its escape up thepipes, substantially as set forth.

In testimony that I claim the foregoing, I have hereunto set my hand andseal this 8th day of December, 1873.

WALTER S. STEVENSON.

Witnesses:

JOHN H. GAHILL, ABRAM H. HEiri/IERLY.

thus described my invention, I

The

